Networks Comparison

Overview

In this lesson (3 of 8), students investigate how data is transmitted in wired and wireless networks and compare their properties, focusing on bandwidth, latency and reliability. They then apply this knowledge to evaluate which network type is more suitable in realistic scenarios, including security considerations.

Learning intentions

Students will:

• investigate how data travels through wired and wireless networks
• compare wired and wireless networks using bandwidth, latency and reliability
• explain why security measures (such as encryption) matter when data is transmitted over networks
• evaluate real-world scenarios to choose the most suitable network type

Success criteria

Students can:

• describe key differences in how data is transmitted in wired vs wireless networks
• use evidence to compare bandwidth, latency and reliability
• justify a network choice for a scenario using at least two criteria (speed, reliability, security)
• identify at least one security risk and suggest a protective approach

Curriculum links

• Investigate how data is transmitted and secured in wired and wireless networks including the internet, including comparing bandwidth, latency and reliability (AC9TDI8K02_E1)
• Explain why cryptography is necessary for securing data (AC9TDI8K02_E2)
• Explore how problems can occur in network communication and how they can be solved (AC9TDI8K02_E4)
• Select and use digital tools efficiently to share and present findings ## Lesson structure (60 minutes)

1. 0–6 min · Hook (Quick sort). Teacher displays 6 statements about networks (e.g. “fewer signal drops in storms”, “more mobility”, “higher interference in crowded areas”) and asks students to sort into “wired”, “wireless”, or “both”. Students choose a category and record one reason.
2. 6–15 min · Mini teach (Transmission + properties). Teacher draws a simple model: sender → network → receiver, contrasting “cables/switches” with “radio waves/routers/access points”, then introduces bandwidth, latency and reliability as the comparison lens. Students complete a 3-column notes table: wired, wireless, both.
3. 15–25 min · Investigation (Latency + reliability demonstration). Teacher runs a short “packet journey” simulation with the class (e.g. teams pass “packets” to represent cables/switch paths; another round uses “interference” cards like “walls”, “nearby devices”, “distance”). Students record observed effects on delay and loss, linking them to latency and reliability.
4. 25–35 min · Security reasoning (Why encryption matters). Teacher explains that data can be intercepted on wireless links more easily, and that cryptography helps protect information during transmission. Students read a short scenario card (e.g. login or payment info on public Wi‑Fi) and answer: “What could go wrong without protection?” and “What protects the data and how would it change what an attacker sees?”
5. 35–52 min · Scenario evaluation (Choose the best network). Students work in groups of 3–4 on three scenario briefs:

• A school workshop where devices must connect reliably during practical activities
• A sports event with high device movement and temporary coverage
• Staff access to sensitive records when working across campus Teacher asks each group to fill a decision grid using speed (bandwidth/latency), reliability, and security (presence of encryption and protections).

6. 52–58 min · Share (Gallery walk). Groups rotate to two other decision grids and add one “evidence comment” and one “question” using sentence stems provided by the teacher. Students read, respond, and capture one improvement for their own grid.
7. 58–60 min · Exit ticket (Justify). Students write a 4–5 sentence justification: “In my scenario, wired/wireless is best because…” including at least one property and one security statement.

Resources

• Scenario brief cards (3 per group)
• Decision grid template (speed/reliability/security)
• Interference “cards” for the simulation
• “Packet journey” prompt sheet for recording observations
• Markers/whiteboard or slide for the transmission model
• Device access (optional) for digital sharing of one group summary using a shared document or slide
• Sentence stems for peer feedback (e.g. “I agree/disagree because…”, “Evidence I used…”, “A question I have…”)

Assessment

• Teacher circulates during sorting and notes to check for accurate understanding of key differences.
• Observation of investigation recordings: students should link interference to latency/reliability effects.
• Collect exit tickets to confirm each student can justify a network choice using speed, reliability and security (at least one evidence-based reason).
• Optional: review decision grids for quality of reasoning and inclusion of security/cryptography ideas.

Differentiation

• Support: Provide sentence starters and a simplified decision grid with examples of “bandwidth/latency/reliability” phrasing.
• Support: Offer a model paragraph for the security question (what could happen without protection, and what cryptography does).
• Extension: Ask groups to add a “problem and solution” line (e.g. interference causes dropped packets; how protocols or routing approaches help) and justify trade-offs.
• EAL/SEN: Allow graphic responses (e.g. arrows, symbols) alongside sentences; provide a word bank (wired, wireless, bandwidth, latency, reliability, interference, encryption, secure).